SELF_GAIN

        Phase  calibration convergence factor, in range ]0-1]. At each iteration
    the applied phase is SELF_GAIN  times  the  derived  phase.  Default  is  1.
    Smaller  values will slow down convergence, but may stabilize the process if
    the initial model is poor. Do not make it smaller than about 0.7, however.

      This is only used for PHASE Self-Calibration.